Schematic diagram of the hot-rolled processing device-Jinan Air Ocean Marine Machinery Co., Ltd.

Schematic diagram of the hot-rolled processing device

2014/4/22 view:

最大应变量Σmax（%）
裂纹-应变图表

（3）Sand to prevent sticking

In order to reach the riser and the surrounding near net shape casting technology , while casting mold were measured and thermal analysis simulation , in order to grasp the thermal load condition. Abduction very thick neck mold parts and liquidus temperatures similar to last more than a few hours , conditions can be quite harsh. Start , once from the perspective of refractoriness refractory mold were studied with experimental , because the cast is not easy to separate and give up. So again on the sand were studied, in order to prevent sticky sand , sand for casting , adhesives and coatings conducted to explore the best fit , do not cause sticky sand there are several necessary conditions : sand have a certain refractoriness ; do not react with the molten steel ; sand does not enter the molten steel . According to the above ideas were small trials , to make a serious part of the heat load , near-net -based technology , is the best combination of sand : the original mullite sand artificial sand ; alkaline phenolic resin binder ; paint with a special alumina coatings. So you can get no sticky sand casting in actual production .

3 . Local casting technology

In order to turn the corner parts of the micro- neck compression method developed for hot rolling process . Its setup is shown by the rotary table and the heating and pressurizing nozzle device body composition .

热轧加工装置概略图

表1 加工条件不同，消除缺陷，效果的变化

装置	主要规格
回转工作台	·工作台直径 ·驱动方式 ·最大扭矩	5000mm 电动式 55T.m
滚子加压装置	·加压力 ·耐曲力	Max.130吨 100吨
付属装置	·滚子交换用悬臂吊 ·曲拐固定装置
加工对象曲拐	·重量 ·拐预直径	Max.约30吨 490-1008mm

表2 压缩深度，静水压应力和相应的应变

压缩量(mm)	滚子直径(mm)	压缩深度(mm)	静水压应力(MPa/MPa)	相应的应变
0.5	52	10	1.03	0.97
0.9	66	12	1.03	1.07
1.4	140	18	0.95	0.86
3.0	90	20	1.00	1.00
3.0	140	25	0.96	0.77
2.0	180	25	0.98	0.69

Body pressing means may be moved in the direction perpendicular to the paper , only when the work roll is advanced to the rotary table above, the pressing means is equipped on both sides of the cylinder main body is C-shaped frame structure can be raised and lowered , the two cylinders end portions provided with work rolls and backup rolls , inserted into the neck and turn the crank of fillet processing. This technology is characterized by clear and compact miniature pressure conditions and high load capacity of the structure of the roll reuse design techniques and operating conditions . In order to meet the various crank hot plus , in the design of the roller must also have roller size. First , the depth of the study area micro- compression experiments changing the roller diameter and the pressing amount . Elimination of different processing conditions to eliminate the effect of different defects , increase of the compression amount, the depth effect is also increased , but not a straight line, the depth of the large diameter roller is large effect , see Table 1.
To be more specific micro- compression conditions, the three-dimensional finite element analysis , and comparison with experimental results . Depth limit micro-cavity completely disappeared , corresponding hydrostatic stress and strain values in Table 2, however , the hydrostatic stress during processing , in fact, due to the different processing temperatures and material changes , the deformation resistance of different and must be changed. 90mm diameter roller when compressed 3mm depth 20 mm hydrostatic stress limit values outside the microscopic craters as compaction , in order to achieve the roller diameter , compression , compaction depth of the relationship , as shown in the figure below. Excluding the effects of different temperatures , material, etc. and sorted out , can be used to design operating conditions. The actual production of the product from the surface sequentially cutting through infiltration operation , magnetic operation, confirmed after hot rolling process from the surface to 30mm, depth has to eliminate defects.

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